*{
  margin: 0;
  padding: 0;
  font-family: consolas;
}
body{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #080b1f;
}
ul{
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
ul li {
  list-style: none;
}
ul li a{
  position: relative;
  font-size: 2em;
  color: #fff;
  text-decoration: none;
  margin: 10px 0;
  display: inline-block;
  padding: 0 20px;
}

#marker{
  position: absolute;
  top:0;
  height: 50px;
  background: #2196f3;
  border-radius: 2px;
  transition: 0.5s;
  margin-top: -5px;
}